Tumors of the pituitary gland can result in the secretion of large amounts of melanocyte-stimulating hormone (MSH), which results in a darkening of the skin. Vitamin D is produced in the skin. Vitamin D is produced in the skin. Check ALL facts that are true about the integumentary system. The skin is very important organ; it forms the protective covering for our body. In this video Paul Andersen details the important structures and functions of the integumentary system. The keratinocytes that compose the stratum lucidum are dead and flattened (see Figure 5.5). Difficulty. – water-proof layer ii. It has a fifth layer, called the stratum lucidum, located between the stratum corneum and the stratum granulosum (Figure 5.3). A keratinocyte is a cell that manufactures and stores the protein keratin. Credit: Illustration by Kathryn Born, MA From the outside in, these layers are the following: Stratum corneum (literally the “horny layer”) is about 20 layers […] Thus, the amount of melanin present in our skin is dependent on a balance between available sunlight and folic acid destruction, and protection from UV radiation and vitamin D production. The Structure of the Integumentary System Epidermis: . The skin consists of two main layers and a closely associated layer. Also found in the basal layer of the skin are touch receptor cells called Merkel cells. Melanin occurs in two primary forms. It has a variety of additional functions; it may serve to waterproof, and protect the deeper tissues, excrete wastes, and regulate body temperature, and is the attachment site for sensory receptors to detect pain, sensation, pressure, and temperature. Credit: Illustration by Kathryn Born, MA From the outside in, these layers are the following: Stratum corneum (literally the “horny layer”) is about 20 layers […] The desmosomes interlock with each other and strengthen the bond between the cells. In addition, collagen binds water to keep the skin hydrated. Not only is this a problem for the individuals affected, but it also has a severe impact on our healthcare system. Melanin is a pigment that helps protect the skin from harmful ultraviolet solar radiation by giving it a brown hue. Questions. This stored fat can serve as an energy reserve, insulate the body to prevent heat loss, and act as a cushion to protect underlying structures from trauma. 2. The stratum basale is a single layer of cuboidal-shaped keratinocytes. What does the Integumentary system contain and why is/are it/they vital? Skin is the largest organ in human body by both it’s weight and surface area. Bailey, Regina. Structurally, the skin consists of two layers which differ in function, histological appearance and their embryological origin. This quiz/worksheet combo will help test your understanding of the dermal layer. Integumentary System: Skin Appendages. ThoughtCo, Aug. 27, 2020, thoughtco.com/integumentary-system-373580. Or do you think about the fact that the skin belongs to one of the body’s most essential and dynamic systems: the integumentary system? Functions of the integumentary system include providing a protective covering for the body, sensing the environment, and helping the body maintain homeostasis. Although you may not typically think of the skin as an organ, it is in fact made of tissues that work together as a single structure to perform unique and critical functions. Protection, Regulation, Sensory, Secretion. A layer tissue underneath the epidermis of the skin which contains blood vessels, lymphatic vessels, nerves, sensory receptors, and oil and sweat glands. Regina Bailey is a board-certified registered nurse, science writer and educator. It is not strictly a part of the skin, although the border between the hypodermis and dermis can be difficult to distinguish. Biology Prefixes and Suffixes: Derm- or -Dermis, Learn About All the Different Organ Systems in the Human Body, Understanding the Healing Uses of Artificial Skin, The Purpose and Composition of Adipose Tissue, Epithelial Tissue: Function and Cell Types, A.S., Nursing, Chattahoochee Technical College. In fact, the skin and accessory structures are the largest organ system in the human body. epidermis and dermis. The reticular layer appears reticulated (net-like) due to a tight meshwork of fibers. It is interesting to note that the “spiny” nature of this layer is an artifact of the staining process. The integument as an organ: 3. Structurally, the skin is divided into 3 main layers, namely: Epidermis. Exposure to the UV rays of the sun or a tanning salon causes melanin to be manufactured and built up in keratinocytes, as sun exposure stimulates keratinocytes to secrete chemicals that stimulate melanocytes. Individuals with albinism tend to appear white or very pale due to the lack of melanin in their skin and hair. The epidermis has several essential elements: The stratum corneum is the outermost layer of the epidermis made of dead flattened cells filled with keratin. What are the basic functions of each of these layers? The skin is the body's biggest organ. Sequential Easy First Hard First. The integument is the body’s largest organ and accounts for 15% of body weight. Watch this video to learn about the challenges these children and their family face. The integumentary system helps regulate body temperature through its tight association with the sympathetic nervous system, the division of the nervous system involved in our fight-or-flight responses. 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